High-performance batteries are very expensive and need to be replaced after typically 700 charges. Here is a simple way to calculate the numbers. The computer battery for my laptop (on which I am writing this) stores 60 watt-hours of electric energy. It can be recharged about 700 times. That means it will deliver a total of 42,000 watt-hours, or 42 kilowatt-hours, before it has to be replaced for $130.

Muller implies in this post that a car would need to replace the battery after only 700 cycles, but although this might have been the case at the time, car battery suppliers are continually extending the life of a battery.

In the world of batteries, what does â€œend of lifeâ€ really mean? According to the industry, end of life is defined as that point in time when a battery has lost 20% of its original energy storage capacity or 25% of its peak power capacity. This implies that an EV battery, with an initial range of 100 miles per charge, will reach its end of life when, years later, it only delivers 80 miles per charge.

That time is likely to be reached only after the battery has carried an electric car about 200,000 miles or 2,000 cycles. But that’s not really the end for an EV battery â€“ it’s just the beginning of a second life that not many people know about.

All this goes to show that Muller’s expertise in a branch of physics does not necessarily extend to expertise in economics, engineering and battery chemistry. Muller had tried to dismiss the Tesla roadster before it was released by claiming that it would cost too much and the batteries would be too heavy Confusing Future Presidents part 1. But the Tesla was launched successfully as a niche sports car. Now the GM Volt and Nissan Leaf are also proving that it is possible to build electric cars.